package com.hyd.appserver.http;

/*
*  Licensed to the Apache Software Foundation (ASF) under one
*  or more contributor license agreements.  See the NOTICE file
*  distributed with this work for additional information
*  regarding copyright ownership.  The ASF licenses this file
*  to you under the Apache License, Version 2.0 (the
*  "License"); you may not use this file except in compliance
*  with the License.  You may obtain a copy of the License at
*
*    http://www.apache.org/licenses/LICENSE-2.0
*
*  Unless required by applicable law or agreed to in writing,
*  software distributed under the License is distributed on an
*  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
*  KIND, either express or implied.  See the License for the
*  specific language governing permissions and limitations
*  under the License.
*
*/

import org.apache.mina.core.buffer.IoBuffer;
import org.apache.mina.core.session.IoSession;
import org.apache.mina.filter.codec.ProtocolEncoderOutput;
import org.apache.mina.filter.codec.demux.MessageEncoder;

import java.nio.charset.CharacterCodingException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetEncoder;
import java.util.Map.Entry;

/**
 * A {@link MessageEncoder} that encodes {@link HttpResponseMessage}.
 *
 * @author The Apache MINA Project (dev@mina.apache.org)
 * @version $Rev: 590006 $, $Date: 2007-10-30 18:44:02 +0900 (화, 30 10월 2007) $
 */
public class HttpResponseEncoder implements MessageEncoder<HttpResponseMessage> {

    private static final byte[] CRLF = new byte[]{0x0D, 0x0A};

    public HttpResponseEncoder() {
    }

    public void encode(IoSession session, HttpResponseMessage message,
                       ProtocolEncoderOutput out) throws Exception {
        IoBuffer buf = IoBuffer.allocate(256);
        // Enable auto-expand for easier encoding
        buf.setAutoExpand(true);

        try {
            // output all headers except the content length
            CharsetEncoder encoder = Charset.forName("UTF-8").newEncoder();
            buf.putString("HTTP/1.1 ", encoder);
            buf.putString(String.valueOf(message.getResponseCode()), encoder);
            switch (message.getResponseCode()) {
                case HttpResponseMessage.HTTP_STATUS_SUCCESS:
                    buf.putString(" OK", encoder);
                    break;
                case HttpResponseMessage.HTTP_STATUS_NOT_FOUND:
                    buf.putString(" Not Found", encoder);
                    break;
            }
            buf.put(CRLF);
            for (Entry<String, String> entry : message.getHeaders().entrySet()) {
                buf.putString(entry.getKey(), encoder);
                buf.putString(": ", encoder);
                buf.putString(entry.getValue(), encoder);
                buf.put(CRLF);
            }
            // now the content length is the body length
            buf.putString("Content-Length: ", encoder);
            buf.putString(String.valueOf(message.getBodyLength()), encoder);
            buf.put(CRLF);
            buf.put(CRLF);
            // add body
            buf.put(message.getBody());
            //System.out.println("\n+++++++");
            //for (int i=0; i<buf.position();i++)System.out.print(new String(new byte[]{buf.get(i)}));
            //System.out.println("\n+++++++");
        } catch (CharacterCodingException ex) {
            ex.printStackTrace();
        }

        buf.flip();
        out.write(buf);
    }
}